/Engine/Plugins/Online/OnlineSubsystem/Source/Public/OnlineSubsystem.h
Delegate fired when a configuration change was detected as a result of ReloadConfigs being called. Allows application code to inject custom configuration data before the new configuration is used.
typedef TMulticastDelegate_OneParam< void, const [TSet](API\Runtime\Core\Containers\TSet)< [FString](API\Runtime\Core\Containers\FString) > & > FOnConfigChanged